Ukuphumelela! Awona mandla aphezulu ehlabathi yi-3 μm phakathi kwe-infrared femtosecond fiber laser

Ukuphumelela! Awona mandla aphezulu ehlabathini yi-3 μm phakathi kwe-infraredfemtosecond ifayibha laser

Ifayibha laserukufezekisa i-laser ephakathi kwe-infrared, inyathelo lokuqala kukukhetha imathiriyeli yefiber matrix efanelekileyo. Kwifiber lasers ekufutshane ne-infrared, i-quartz glass matrix yeyona nto ixhaphakileyo yefiber matrix imathiriyeli enelahleko ephantsi kakhulu yosulelo, amandla athembekileyo oomatshini kunye nokuzinza okuhle kakhulu. Nangona kunjalo, ngenxa ye-phonon yamandla aphezulu (i-1150 cm-1), i-quartz fiber ayinakusetyenziselwa ukuhanjiswa kwe-laser ephakathi kwe-infrared. Ukuze sifezekise ukuhanjiswa kwelahleko ephantsi ye-laser ephakathi kwe-infrared, kufuneka siphinde sikhethe ezinye izinto zefiber matrix ezinamandla aphantsi ephonon, njenge-sulfide glass matrix okanye i-fluoride glass matrix. I-fiber ye-Sulfide inamandla e-phonon ephantsi kakhulu (malunga ne-350 cm-1), kodwa inengxaki yokuba i-doping concentration ayinakunyuswa, ngoko ayifanelekanga ukusetyenziswa njengefayibha yokuzuza ukuvelisa i-laser ephakathi kwe-infrared. Nangona i-substrate yeglasi ye-fluoride inamandla ephonon aphezulu kancinane (550 cm-1) kune-substrate yeglasi ye-sulfide, inokuphinda ifikelele kwilahleko ephantsi yosasazo kwiilaser eziphakathi kwe-infrared ezinobude obungaphantsi kwe-4 μm. Okubaluleke ngakumbi, i-substrate yeglasi ye-fluoride inokufikelela kwinqanaba eliphezulu elinqabileyo le-ion doping concentration, enokubonelela ngenzuzo efunekayo kwisizukulwana se-laser ephakathi kwe-infrared, umzekelo, i-fluoride ekhulile kakhulu i-ZBLAN fiber ye-Er3 + iye yakwazi ukufezekisa i-doping concentration ye-doping ukuya kwi-10 mol. Ke ngoko, iglasi ye-fluoride matrix yeyona nto ifanelekileyo yefiber matrix imathiriyeli yefiber ephakathi kwe-infrared.

Kutshanje, iqela likaNjingalwazi uRuan Shuangchen kunye noNjingalwazi uGuo Chunyu kwiYunivesithi yaseShenzhen baphuhlise i-femtosecond ephezulu yamandla.i-fiber laser ye-pulseiqulunqwe nge-2.8μm i-mode-lock Er: i-ZBLAN i-fiber oscillator, i-mode-mode Er: i-ZBLAN i-fiber preamplifier kunye ne-mode-mode field Er: i-ZBLAN fiber main amplifier.
Ngokusekelwe kwi-self-compress kunye ne-amplification ithiyori ye-middle-infrared ultra-short pulse elawulwa yi-polarization state kunye nomsebenzi wokulinganisa amanani weqela lethu lophando, elidityaniswe nokunyanzeliswa kwe-nonlinear kunye neendlela zokulawula imodi ye-fiber optical mode enkulu, iteknoloji yokupholisa esebenzayo kunye nesakhiwo sokukhulisa impompo ephindwe kabini, inkqubo ifumana i-2.8-short ye-2. ipulse ububanzi 148 fs. Irekhodi lamazwe ngamazwe lelona gunya liphezulu elifunyenwe leli qela lophando liye lahlaziywa ngakumbi.

Umzobo we-1 Umzobo weSakhiwo se-Er: i-ZBLAN i-fiber laser esekelwe kwisakhiwo se-MOPA
Ubume belaser femtosecondinkqubo iboniswe kwi-Figure 1. I-mode-mode double-clad Er: i-ZBLAN i-fiber ye-3.1 m ubude isetyenziswe njenge-fiber yokufumana i-fiber kwi-preamplifier kunye ne-doping concentration ye-7 mol.% kunye ne-core diameter ye-15 μm (NA = 0.12). Kwi-amplifier ephambili, i-double clad imodi enkulu ye-Er: i-fiber ye-ZBLAN kunye nobude be-4 m yayisetyenziswe njenge-fiber yokufumana i-fiber kunye ne-doping concentration ye-6 mol.% kunye ne-core diameter ye-30 μm (NA = 0.12). Idayamitha engundoqo engundoqo yenza ukuba ifayibha yenzuzo ibe ne-coefficient esezantsi enganeno kwaye inokumelana namandla aphezulu aphezulu kunye nokuphuma kwe-pulse yamandla amakhulu e-pulse. Zombini iziphelo zefayibha yenzuzo zidityanisiwe kwi-AlF3 i-cap ye-terminal.